JP2010502091A - Handover method and control method thereof in wireless communication system - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
本発明の一様相は、無線通信システムで端末と連結した第１基地局が端末のハンドオーバーを制御する方法を開示する。第１基地局は、第２基地局へのハンドオーバー決定後に、端末と第１基地局間の連結設定状態に関連した情報及びデータ送受信状態に関連した情報のうち少なくとも一つを含む状態情報を第２基地局に伝送する。第１基地局は、ハンドオーバー終了後に端末が行なわねばならない動作に関連した動作情報を端末に伝送する。連結設定状態に関連した情報は、端末がハンドオーバーを行う前に上りリンク同期化状態であるかまたは非同期化状態であるかに関する情報を含むことができる。One aspect of the present invention discloses a method in which a first base station connected to a terminal in a wireless communication system controls handover of the terminal. After the handover to the second base station is determined, the first base station receives state information including at least one of information related to a connection setting state between the terminal and the first base station and information related to a data transmission / reception state. Transmit to the second base station. The first base station transmits operation information related to operations that the terminal must perform after the handover is completed to the terminal. The information related to the connection setup state may include information on whether the terminal is in the uplink synchronization state or the desynchronization state before performing the handover.
Description
本発明は、無線通信システムに関するもので、より具体的には、無線通信網システムにおけるハンドオーバー方法及びその制御方法に関する。 The present invention relates to a radio communication system, and more specifically to a handover method and a control method thereof in a radio communication network system.
無線通信システムでいうハンドオーバーとは、呼（call）が連結されている状態の端末（UE:user equipment）が、該当の基地局サービス地域から離れて隣接基地局サービス地域へと移動する時に、移動端末が当該隣接基地局の新しい通話チャネルに自動同調して引き続き通話状態が維持されるようにする機能のことを指す。大容量データパケット通信を主な特徴とする広帯域無線通信システムでは、限定された通信資源を考慮して既存のハンドオーバー方式とは異なるより効率的なハンドオーバー方式が要求される。 Handover in a wireless communication system means that a terminal (UE: user equipment) in a state where a call is connected moves away from the corresponding base station service area to an adjacent base station service area. This refers to a function that allows a mobile terminal to automatically tune to a new call channel of the adjacent base station and maintain the call state. A broadband wireless communication system mainly characterized by large-capacity data packet communication requires a more efficient handover method that is different from existing handover methods in consideration of limited communication resources.
図１は、従来技術による無線通信システムにおけるハンドオーバー過程を示すフローチャートである。 FIG. 1 is a flowchart illustrating a handover process in a wireless communication system according to the prior art.
中心基地局（source eNB）が指定された基準を満足したり特定イベントが発生すると、端末は測定報告メッセージを該中心基地局に伝送する（Ｓ１１０）。この中心基地局は、ハンドオーバーを行う前に端末との連結が設定されているネットワークノードを意味する。中心基地局は、端末からの測定報告メッセージを参照してハンドオーバーが必要な状況だと判断されると、ハンドオーバー決定をおろす（Ｓ１１５）。 When the central base station (source eNB) satisfies the specified criteria or a specific event occurs, the terminal transmits a measurement report message to the central base station (S110). The central base station means a network node in which connection with a terminal is set before a handover is performed. If the central base station determines that the handover is necessary with reference to the measurement report message from the terminal, the central base station determines the handover (S115).
中心基地局は、対象基地局（target eNB）にＵＥ文脈情報を含むハンドオーバー準備メッセージを伝送する（Ｓ１２０）。対象基地局とは、ハンドオーバーによって端末が移動するようになる新しいセルを管理する基地局のことを意味する。ＵＥ文脈情報は、端末が中心基地局から受信していたサービスの品質（QoS）、無線ベアラタイプなどと関連した情報が含まれる。 The central base station transmits a handover preparation message including UE context information to the target base station (target eNB) (S120). The target base station means a base station that manages a new cell in which a terminal moves due to handover. The UE context information includes information related to the quality of service (QoS) received by the terminal from the central base station, the radio bearer type, and the like.
対象基地局は、自身の有無線資源（resource）を考慮してハンドオーバー要求を受容するか否かを決定する。ハンドオーバーを受容すると決定した場合、端末との連結のための資源を確保し（Ｓ１２５）、端末に対する新しい臨時識別子（C-RNTI）と一緒に端末に対する資源設定情報を中心基地局に伝達する（Ｓ１３０）。 The target base station determines whether to accept the handover request in consideration of its own wired / wireless resource. When it is determined that the handover is accepted, a resource for connection with the terminal is secured (S125), and resource setting information for the terminal is transmitted to the central base station together with a new temporary identifier (C-RNTI) for the terminal ( S130).
中心基地局は、端末にハンドオーバー命令を送信し（Ｓ１４０）、対象基地局への使用者データの伝送を始める。端末は、対象基地局とのタイミング同期化を含む無線環境を再設定するために第１階層（Layer 1）及び第２階層（Layer 2）に関するシグナリング（signaling）を行なう（Ｓ１５０）。端末は、対象基地局からタイミング情報を受信し、以降、端末は対象基地局にハンドオーバー確認メッセージを送信する（Ｓ１６０）。対象基地局は中心基地局にハンドオーバーの成功を知らせるハンドオーバー終了メッセージを送る（Ｓ１７０）。その後、中心基地局は端末に対する全ての資源を解除する。対象基地局はコアネットワーク（MME/UPE）に端末の位置を更新するように要請する（Ｓ１８０）。すると、コアネットワークは、端末に対する経路設定を切り替え（switch）、既存に中心基地局に伝達していた使用者データを対象基地局に伝達する（Ｓ１９０）。 The central base station transmits a handover command to the terminal (S140) and starts transmitting user data to the target base station. The terminal performs signaling on the first layer (Layer 1) and the second layer (Layer 2) in order to reset the wireless environment including timing synchronization with the target base station (S150). The terminal receives timing information from the target base station, and thereafter, the terminal transmits a handover confirmation message to the target base station (S160). The target base station sends a handover end message notifying the central base station of the successful handover (S170). Thereafter, the central base station releases all resources for the terminal. The target base station requests the core network (MME / UPE) to update the location of the terminal (S180). Then, the core network switches the path setting for the terminal (switch), and transmits the user data that has been transmitted to the central base station to the target base station (S190).
しかしながら、上記の従来技術によるハンドオーバー方法では、端末がハンドオーバーを行う前における中心基地局との連結設定状態やデータ送受信状態は考慮されていない。このため、ハンドオーバーを行う前における中心基地局との連結設定状態またはデータ送受信状態によってはハンドオーバー終了後に端末が余分な動作を行なわねばならず、端末電力が非効率的に使われるという問題点があった。 However, in the above-described conventional handover method, the connection setting state and the data transmission / reception state with the central base station before the terminal performs handover are not considered. For this reason, depending on the connection setting state or data transmission / reception state with the central base station before the handover is performed, the terminal must perform an extra operation after the handover is completed, and the terminal power is used inefficiently. was there.
本発明は上記従来技術の問題点を解決するためのもので、その目的は、無線通信システムでハンドオーバーを行う際にハンドオーバー前の端末の状態を考慮できる方法を提供することにある。 The present invention is to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a method that can take into account the state of a terminal before handover when performing handover in a wireless communication system.
本発明の他の目的は、無線通信システムでハンドオーバーを行う際に端末の電力効率などを向上させる方法を提供することにある。 Another object of the present invention is to provide a method for improving the power efficiency of a terminal when performing a handover in a wireless communication system.
本発明の一様相は、無線通信システムで端末と連結された第１基地局が端末のハンドオーバーを制御する方法を開示する。第１基地局は第２基地局へのハンドオーバー決定後に、端末と第１基地局間の連結設定状態に関連した情報及びデータ送受信状態に関連した情報のうち少なくとも一つを含む状態情報を第２基地局に伝送する。第１基地局は、端末がハンドオーバー終了後に行なわねばならない動作に関連した動作情報を端末に伝送する。連結設定状態に関連した情報は、端末がハンドオーバーを行う前に上りリンク同期化状態であるかまたは非同期化状態であるかに関する情報を含むことができる。 One aspect of the present invention discloses a method in which a first base station connected to a terminal in a wireless communication system controls handover of the terminal. After determining the handover to the second base station, the first base station receives state information including at least one of information related to a connection setting state between the terminal and the first base station and information related to a data transmission / reception state. 2 Transmit to base station. The first base station transmits operation information related to operations that the terminal must perform after the handover is completed to the terminal. The information related to the connection setup state may include information on whether the UE is in the uplink synchronization state or the desynchronization state before performing the handover.
本発明の他の様相は、無線通信システムで端末が第１セルから第２セルへのハンドオーバーを行なう方法を開示する。端末は、端末がハンドオーバー完了後に第２セルで行なわねばならない動作に関連した情報を含む動作情報を、第１セルを管理する基地局または第２セルを管理する基地局から受信する。端末は、ハンドオーバー完了後に第２セルで動作情報に応じた動作を行なう。 Another aspect of the present invention discloses a method in which a terminal performs a handover from a first cell to a second cell in a wireless communication system. The terminal receives, from the base station that manages the first cell or the base station that manages the second cell, operation information including information related to the operation that the terminal must perform in the second cell after the handover is completed. The terminal performs an operation according to the operation information in the second cell after the handover is completed.
以下に添付の図面を参照しつつ説明される本発明の実施例から、本発明の構成、作用及び他の特徴が容易に理解される。以下に説明される実施例は、本発明の技術的特徴がＥ−ＵＭＴＳ（Evolved Universal Mobile Telecommunications System）に適用された例とする。 The configuration, operation, and other features of the present invention will be easily understood from the embodiments of the present invention described below with reference to the accompanying drawings. The embodiment described below is an example in which the technical features of the present invention are applied to E-UMTS (Evolved Universal Mobile Telecommunications System).
図２は、Ｅ−ＵＭＴＳの網構造を示す図である。Ｅ−ＵＭＴＳシステムは、既存ＷＣＤＭＡ ＵＭＴＳシステムから進化したシステムで、現在３ＧＰＰ（3rd Generation Partnership Project）で基礎的な標準化作業か行なわれている。Ｅ−ＵＭＴＳは、ＬＴＥ（Long Term Evolution）システムとも呼ばれる。ＵＭＴＳ及びＥ−ＵＭＴＳの技術規格（technical specification）の詳細な内容についてはそれぞれ、“3rd Generation Partnership Project; Technical Specification Group Radio Access Network”のRelease 7とRelease 8を参照すれば良い。 FIG. 2 is a diagram illustrating an E-UMTS network structure. The E-UMTS system has evolved from the existing WCDMA UMTS system and is currently undergoing basic standardization work in 3GPP (3rd Generation Partnership Project). E-UMTS is also called an LTE (Long Term Evolution) system. Each For details of UMTS and E-UMTS technical standards (technical specification),; may refer to Release 7 and Release 8 of "3 rd Generation Partnership Project Technical Specification Group Radio Access Network".
図２を参照すると、Ｅ−ＵＴＲＡＮは、基地局（以下、‘ｅＮｏｄｅ Ｂ’または‘ｅＮＢ’と略す。）で構成され、ｅＮＢ間はＸ２インターフェースを通じて連結される。ｅＮＢは、無線インターフェースを通じて端末（User Equipment;以下、‘ＵＥ’と略す。）に連結され、Ｓ１インターフェースを通じてＥＰＣ（Evolved Packet Core）に連結される。 Referring to FIG. 2, the E-UTRAN is configured with a base station (hereinafter abbreviated as 'eNode B' or 'eNB'), and the eNBs are connected through an X2 interface. The eNB is connected to a terminal (User Equipment; hereinafter referred to as “UE”) through a wireless interface, and is connected to an EPC (Evolved Packet Core) through an S1 interface.
端末とネットワーク間の無線インターフェースプロトコル（Radio Interface Protocol）の階層は、通信システムで広く知られた開放型システム間相互接続（Open System Interconnection; OSI）基準モデルの下位３階層に基づいてＬ１（第１階層）、Ｌ２（第２階層）、Ｌ３（第３階層）に区分されることができ、そのうち、第１階層に属する物理階層は、物理チャネル（Physical Channel）を用いた情報伝送サービス（Information Transfer Service）を提供し、第３階層に位置する無線資源制御（Radio Resource Control；以下、‘ＲＲＣ’と略す。）階層は、端末とネットワーク間に無線資源を制御する役割を果たす。そのため、ＲＲＣ階層は、端末とネットワーク間にＲＲＣメッセージが互いに交換されるようにする。ＲＲＣ階層は、Ｎｏｄｅ ＢとＡＧなどネットワークノードに分散して位置しても良く、Ｎｏｄｅ ＢまたはＡＧと独立して位置しても良い。 The radio interface protocol layer between the terminal and the network is based on the lower three layers of the Open System Interconnection (OSI) standard model widely known in communication systems. Layer), L2 (second layer), and L3 (third layer), of which the physical layer belonging to the first layer is an information transfer service (Information Transfer) using a physical channel (Physical Channel) The Radio Resource Control (Radio Resource Control; hereinafter abbreviated as “RRC”) layer located in the third layer serves to control radio resources between the terminal and the network. Therefore, the RRC layer allows RRC messages to be exchanged between the terminal and the network. The RRC layer may be distributed among network nodes such as Node B and AG, or may be positioned independently of Node B or AG.
図３は、Ｅ−ＵＴＲＡＮ（Evolved Universal Terrestrial Radio Access Network）の概略的な構成図である。図３で、ハッチング（hatching）した部分は、使用者平面（user plane）の機能的エンティティを示し、ハッチングしていない部分は制御平面（control plane）の機能的エンティティを示す。 FIG. 3 is a schematic configuration diagram of an E-UTRAN (Evolved Universal Terrestrial Radio Access Network). In FIG. 3, the hatched portion indicates a functional entity in the user plane, and the non-hatched portion indicates a functional entity in the control plane.
図４Ａ及び図４Ｂは、端末（ＵＥ）とＥ−ＵＴＲＡＮ間の無線インターフェースプロトコル（Radio Interface Protocol）の構造を示す図であり、図４Ａが制御平面プロトコル構成図で、図４Ｂが使用者平面プロトコル構成図である。図４Ａ及び図４Ｂの無線インターフェースプロトコルは、水平的に物理階層（Physical Layer）、データリンク階層（Data Link Layer）及びネットワーク階層（Network Layer）からなり、垂直的にはデータ情報伝送のための使用者平面（User Plane）と制御信号（Signaling）伝達のための制御平面（Control Plane）とに区分される。図４Ａ及び図４Ｂのプロトコル階層は、通信システムで広く知られた開放型システム間相互接続（Open System Interconnection; OSI）基準モデルの下位３階層に基づいてＬ１（第１階層）、Ｌ２（第２階層）、Ｌ３（第３階層）に区分されることができる。 4A and 4B are diagrams illustrating a structure of a radio interface protocol between a terminal (UE) and an E-UTRAN, FIG. 4A is a control plane protocol configuration diagram, and FIG. 4B is a user plane protocol. It is a block diagram. The wireless interface protocol of FIGS. 4A and 4B includes a physical layer, a data link layer, and a network layer, and is used for data information transmission in the vertical direction. It is divided into a user plane and a control plane for transmitting a control signal (Signaling). The protocol layers in FIGS. 4A and 4B are based on L1 (first layer) and L2 (second layer) based on the lower three layers of the Open System Interconnection (OSI) standard model widely known in communication systems. Hierarchy) and L3 (third hierarchy).
第１階層たる物理階層は、物理チャネル（Physical Channel）を用いて上位階層に情報伝送サービス（Information Transfer Service）を提供する。物理階層は、上位にある媒体接続制御（Medium Access Control）階層とは伝送チャネル（Transport Channel）を通じて連結されており、この伝送チャネルを通じて媒体接続制御階層と物理階層間のデータが移動する。そして、互いに異なる物理階層間、すなわち、送信側と受信側の物理階層間は物理チャネルを通じてデータが移動する。Ｅ−ＵＭＴＳで物理チャネルはＯＦＤＭ（Orthogonal Frequency Division Multiplexing）方式で変調され、よって、時間（time）と周波数（frequency）を無線資源として用いる。 The physical layer as the first layer provides an information transfer service to an upper layer using a physical channel. The physical layer is connected to an upper medium access control layer through a transmission channel, and data between the medium connection control layer and the physical layer moves through the transmission channel. Then, data moves between physical layers different from each other, that is, between physical layers on the transmission side and the reception side through a physical channel. In E-UMTS, a physical channel is modulated by an OFDM (Orthogonal Frequency Division Multiplexing) scheme, and therefore, time and frequency are used as radio resources.
第２階層の媒体接続制御（Medium Access Control；以下、‘ＭＡＣ’と略す。）階層は、論理チャネル（Logical Channel）を通じて上位階層の無線リンク制御（Radio Link Control）階層にサービスを提供する。第２階層の無線リンク制御（Radio Link Control；以下、‘ＲＬＣ’と略す。）階層は、信頼性あるデータの伝送を支援する。第２階層のＰＤＣＰ階層は、ＩＰｖ４やＩＰｖ６のようなＩＰパケットを用いて転送されるデータを相対的に帯域幅の小さい無線区間で効率的に伝送するために余分な制御情報を減らすヘッダ圧縮（Header Compression）機能を行なう。 The medium access control (Medium Access Control; hereinafter abbreviated as 'MAC') layer of the second layer provides a service to a radio link control layer of a higher layer through a logical channel (Logical Channel). The radio link control (Radio Link Control; hereinafter abbreviated as 'RLC') layer in the second layer supports reliable data transmission. The PDCP layer of the second layer is a header compression that reduces unnecessary control information in order to efficiently transmit data transferred using IP packets such as IPv4 and IPv6 in a wireless section with a relatively small bandwidth ( (Header Compression) function.
第３階層の最も下部に位置する無線資源制御（Radio Resource Control；以下、‘ＲＲＣ’と略す。）階層は、制御平面でのみ定義され、無線ベアラ（Radio Bearer;以下、‘ＲＢ’と略す。）の設定（Configuration）、再設定（Re-configuration）及び解除（Release）に関連して論理チャネル、伝送チャネル及び物理チャネルの制御を担当する。この場合、ＲＢは端末とＵＴＲＡＮ間のデータ伝達のために第２階層により提供されるサービスのことを意味する。 The radio resource control (Radio Resource Control; hereinafter abbreviated as “RRC”) layer located at the bottom of the third hierarchy is defined only in the control plane and is abbreviated as “Radio Bearer” (hereinafter, “RB”). ) Is responsible for control of logical channels, transmission channels, and physical channels in connection with configuration, re-configuration, and release. In this case, RB means a service provided by the second layer for data transmission between the terminal and the UTRAN.
ネットワークで端末にデータを伝送する下りリンク伝送チャネルには、システム情報を伝送するＢＣＨ（Broadcast Channel）、ページングメッセージを伝送するＰＣＨ（Paging Channel）、その他に使用者トラフィックや制御メッセージを伝送する下りリンクＳＣＨ（Shared Channel）がある。下りリンクマルチキャストまたは放送サービスのトラフィックまたは制御メッセージは下りリンクＳＣＨを通じて伝送されても良く、または、別の下りリンクＭＣＨ（Multicast Channel）を通じて伝送されても良い。一方、端末から網へとデータを伝送する上りリンク伝送チャネルには、初期制御メッセージを伝送するＲＡＣＨ（Random Access Channel）とその他に使用者トラフィックや制御メッセージを伝送する上りリンクＳＣＨ（Shared Channel）がある。 The downlink transmission channel for transmitting data to the terminal in the network includes a BCH (Broadcast Channel) for transmitting system information, a PCH (Paging Channel) for transmitting paging messages, and a downlink for transmitting user traffic and control messages. There is SCH (Shared Channel). The downlink multicast or broadcast service traffic or the control message may be transmitted through the downlink SCH, or may be transmitted through another downlink MCH (Multicast Channel). On the other hand, an uplink transmission channel that transmits data from the terminal to the network includes an RACH (Random Access Channel) that transmits initial control messages and an uplink SCH (Shared Channel) that transmits user traffic and control messages. is there.
伝送チャネルの上位にあり、伝送チャネルにマッピングされる論理チャネル（Logical Channel）には、ＢＣＣＨ（Broadcast Channel）、ＰＣＣＨ（Paging Control Channel）、ＣＣＣＨ（Common Control Channel）、ＭＣＣＨ（Multicast Control Channel）、ＭＴＣＨ（Multicast Traffic Channel）などがある。 The logical channel (Logical Channel) that is higher in the transmission channel and mapped to the transmission channel includes BCCH (Broadcast Channel), PCCH (Paging Control Channel), CCCH (Common Control Channel), MCCH (Multicast Control Channel), and MTCH. (Multicast Traffic Channel).
Ｅ−ＵＭＴＳシステムでは、下りリンクでＯＦＤＭ方式を使用し、上りリンクではＳＣ−ＦＤＭＡ（Single Carrier-Frequency Division Multiple Access）方式を使用する。多重搬送波方式であるＯＦＤＭシステムは、搬送波の一部をグループ化した複数の副搬送波（subcarriers）単位に資源を割り当てるシステムで、接続方式としてＯＦＤＭＡ（Orthogonal Frequency Division Multiple Access）を使用する。 In the E-UMTS system, an OFDM scheme is used in the downlink, and an SC-FDMA (Single Carrier-Frequency Division Multiple Access) scheme is used in the uplink. An OFDM system that is a multi-carrier scheme is a system that allocates resources in units of a plurality of subcarriers in which a part of carrier waves is grouped, and uses OFDMA (Orthogonal Frequency Division Multiple Access) as a connection scheme.
ＯＦＤＭまたはＯＦＤＭＡシステムの物理階層では、活性搬送波がグループに分離され、グループ別にそれぞれ異なる受信側に送信される。各ＵＥに割り当てられる無線資源は、２次元空間の時間−周波数領域（time-frequency region）によって定義され、連続した副搬送波の集合である。ＯＦＤＭまたはＯＦＤＭＡシステムで一つの時間−周波数領域は、時間座標と副搬送波座標によって決定される直方形となる。すなわち、一つの時間−周波数領域は、少なくとも一つの時間軸上におけるシンボルと複数の周波数軸上における副搬送波によって区画される直方形となることができる。このような時間-周波数領域は特定ＵＥの上りリンクに割り当てられたりまたは下りリンクでは特定の使用者に基地局が時間−周波数領域を伝送することができる。２次元空間でこのような時間-周波数領域を定義するためには、時間領域におけるＯＦＤＭシンボルの数と周波数領域における、基準点からのオフセット（offset）だけ離れた位置から始まる連続した副搬送波の数が与えられなければならない。 In the physical layer of the OFDM or OFDMA system, active carriers are separated into groups and transmitted to different receivers for each group. The radio resource allocated to each UE is defined by a time-frequency region in a two-dimensional space and is a set of continuous subcarriers. In the OFDM or OFDMA system, one time-frequency domain has a rectangular shape determined by time coordinates and subcarrier coordinates. That is, one time-frequency region can be a rectangular shape partitioned by at least one symbol on a time axis and subcarriers on a plurality of frequency axes. Such a time-frequency domain is allocated to the uplink of a specific UE, or a base station can transmit a time-frequency domain to a specific user in the downlink. In order to define such a time-frequency domain in a two-dimensional space, the number of OFDM symbols in the time domain and the number of consecutive subcarriers starting from a position separated from the reference point in the frequency domain by an offset. Must be given.
現在議論中のＥ−ＵＭＴＳシステムでは１０ｍｓの無線フレーム（radio frame）を使用し、１無線フレームは２０個のサブフレーム（subframe）で構成される。すなわち、１サブフレームは０．５ｍｓである。一つのリソースブロック（resource block）は、一つのサブフレームとそれぞれ１５ｋＨｚ帯域である副搬送波１２個とで構成される。また、１サブフレームは、複数のＯＦＤＭシンボルで構成され、複数のＯＦＤＭシンボルのうちの一部シンボル（例えば、１番目のシンボル）はＬ１／Ｌ２制御情報を伝送するために用いられることができる。 The E-UMTS system under discussion uses a radio frame of 10 ms, and one radio frame is composed of 20 subframes. That is, one subframe is 0.5 ms. One resource block is composed of one subframe and 12 subcarriers each having a 15 kHz band. One subframe is composed of a plurality of OFDM symbols, and a part of the plurality of OFDM symbols (for example, the first symbol) can be used to transmit L1 / L2 control information.
図５は、Ｅ−ＵＭＴＳシステムで使用する物理チャネル構造の一例を示す図で、１サブフレームは、Ｌ１／Ｌ２制御情報伝送領域（ハッチング部分）とデータ伝送領域（非ハッチング部分）とで構成される。 FIG. 5 is a diagram showing an example of a physical channel structure used in the E-UMTS system. One subframe is composed of an L1 / L2 control information transmission area (hatched part) and a data transmission area (non-hatched part). The
一方、ページング（Paging）は、ネットワークがある目的のために一つまたはそれ以上の端末を呼び出すということを意味する。このようなページング機能は、ネットワークが特定端末を見つけるようにする基本的な側面の他にも、必要な場合以外は端末が目覚めていないようにし、端末の電力を節約できるようにする側面もある。すなわち、端末は平素は睡眠（sleeping）状態にあり、自分にネットワークからページングが発生した場合に限って目覚めて（wake-up）、ネットワークが要求する行為をするようになるわけである。 On the other hand, paging means that the network calls one or more terminals for a certain purpose. In addition to the basic aspect that allows the network to find a specific terminal, such a paging function can also be used to prevent the terminal from waking up except when necessary and to save the power of the terminal. . That is, the terminal is normally in a sleeping state, and wakes up only when paging occurs from the network, and the terminal requests the network.
睡眠状態の端末が自身にページングが発生したことに気付くには、周期的に目覚めて自身に宛てられたページング情報があるか否か確認しなければならない。このように端末が常に目覚めているのではなく周期的に目覚めることを不連続受信（Discontinuous Reception；以下、‘ＤＲＸ’という。）といい、ヨーロッパ式ＩＭＴ−２０００システムであるＥ−ＵＭＴＳ（Universal Mobile Telecommunications System）システムでは、端末のページング情報受信方法としてこのようなＤＲＸ方法を使用している。以上では端末がシステムと呼を設定するための構成要素について説明した。 In order for a sleeping terminal to notice that paging has occurred, it must periodically wake up and check whether there is paging information addressed to it. Discontinuous reception (hereinafter referred to as “DRX”) means that the terminal wakes up periodically instead of being always woken up in this way, which is E-UMTS (Universal Mobile) which is a European IMT-2000 system. Telecommunications System) uses such a DRX method as a method for receiving paging information of a terminal. In the above, the component for a terminal to set up a system and a call was demonstrated.
図６は、Ｅ−ＵＴＲＡＮシステムにおけるＲＲＣ連結のために端末（ＵＥ）とＲＮＣ（Radio Network controller）間に交換されるメッセージの伝送と信号連結を設定するためのＩＤＴ（Initial Direct Transfer）メッセージ伝送を示す。ここで、ＲＮＣは、ＲＮＳ内にある装置で、無線資源の使用及び統合（integrity）を制御する機能を果たす。ＲＮＳ（Radio Network Subsystem）は、全体通信システムまたは端末とＥ−ＵＴＲＡＮ間で呼設定手段のための無線資源の割当及び解除を提供するＥ−ＵＴＲＡＮでの接続（access）部分のみを意味する。 FIG. 6 illustrates transmission of messages exchanged between a terminal (UE) and an RNC (Radio Network controller) for RRC connection in an E-UTRAN system, and IDT (Initial Direct Transfer) message transmission for setting signal connection. Show. Here, the RNC is a device in the RNS and functions to control the use and integrity of radio resources. RNS (Radio Network Subsystem) means only an access part in E-UTRAN that provides allocation and release of radio resources for call setup means between the entire communication system or terminal and E-UTRAN.
端末がＵＭＴＳシステムと呼を設定するためには、Ｅ−ＵＴＲＡＮとＲＲＣ連結を設定しなければならないし、ＣＮとは信号連結（Signaling Connection）を設定しなければならない。この過程を説明するために端末のＲＲＣ状態（RRC state）とＲＲＣ連結方法について詳述する。ＲＲＣ状態とは、端末のＲＲＣがＥ−ＵＴＲＡＮのＲＲＣと論理的連結（logical connection）ができているか否かを意味し、連結されている場合はＲＲＣ連結状態（RRC connected state）、連結されていない場合はＲＲＣ待機状態（RRC idle state）と呼ぶ。ＲＲＣ連結状態の端末はＲＲＣ連結（connection）が存在するから、Ｅ−ＵＴＲＡＮは該当の端末の存在をセル単位で把握でき、したがって、端末を效果的に制御することができる。一方、ＲＲＣ待機状態の端末はＥ−ＵＴＲＡＮにより把握されず、セルよりも大きい地域単位であるトラッキング領域（Tracking Area）単位にコアネットワークが管理する。すなわち、ＲＲＣ待機状態端末は、大きい地域単位に存在有無のみ把握され、音声やデータのような通常の移動通信サービスを受けるためにはＲＲＣ連結状態へと移さなければならない。次に、その過程について具体的に説明する。 In order for a terminal to set up a call with a UMTS system, an RRC connection must be set up with the E-UTRAN, and a signaling connection must be set up with the CN. In order to explain this process, the RRC state of the terminal and the RRC connection method will be described in detail. The RRC state means whether the RRC of the terminal is logically connected with the RRC of the E-UTRAN, and when connected, the RRC connected state is connected. If not, it is called RRC idle state. Since a terminal in the RRC connection state has an RRC connection, the E-UTRAN can grasp the presence of the corresponding terminal in units of cells, and thus can effectively control the terminal. On the other hand, the terminal in the RRC standby state is not grasped by E-UTRAN, and is managed by the core network in units of tracking areas that are larger than cells. That is, the RRC standby state terminal can only grasp the presence / absence of a large regional unit and must move to the RRC connection state in order to receive a normal mobile communication service such as voice or data. Next, the process will be specifically described.
使用者が最初に端末の電源をつけたとき、端末はまず適切なセルを探索した後、該当のセルでＲＲＣ待機状態に留まる。ＲＲＣ待機状態に留まっている端末は、ＲＲＣ連結が要求される場合に限ってＲＲＣ連結過程（RRC connection procedure）を通じてＥ−ＵＴＲＡＮのＲＲＣとＲＲＣ連結を設定し、ＲＲＣ連結状態に遷移する。ＲＲＣ待機状態に留まっていた端末がＲＲＣ連結を設定する必要がある場合は様々あるが、例えば、使用者の通話試行などの理由から上りリンクデータ伝送が要求されたり、または、Ｅ−ＵＴＲＡＮからページングメッセージを受信した場合にこれに対する応答メッセージを伝送する場合などが挙げられる。ＲＲＣ連結と信号連結を通じて端末は端末専用制御情報をＵＴＲＡＮまたはＣＮと交換することとなる。図６に示すように、ＲＲＣ連結のための第一の過程として、端末はＲＲＣ連結要請メッセージ（RRC Connection Request Message）をＲＮＣに伝送する。 When the user first turns on the terminal, the terminal first searches for an appropriate cell and then remains in the RRC standby state in the corresponding cell. The terminal staying in the RRC standby state sets the RRC and RRC connection of E-UTRAN through the RRC connection procedure only when the RRC connection is required, and transits to the RRC connection state. There are various cases where a terminal that has remained in the RRC standby state needs to establish an RRC connection. For example, uplink data transmission is required due to a user's call attempt or paging from E-UTRAN. For example, when a message is received, a response message is transmitted. Through the RRC connection and the signal connection, the terminal exchanges terminal-specific control information with UTRAN or CN. As shown in FIG. 6, as a first process for RRC connection, the terminal transmits an RRC connection request message to the RNC.
また、ＲＲＣ連結要請メッセージに対する応答としてＲＮＣはＲＲＣ連結設定メッセージ（RRC Connection Setup Message）を端末に伝送する。端末はＲＲＣ連結設定完了メッセージ（RRC Connection Setup Complete Message）をＲＮＣに伝送する。以上の過程が成功的に終了することで端末とＲＮＣはＲＲＣ連結を設定することとなる。ＲＲＣ連結が設定された後、端末はＩＤＴメッセージを伝送して信号連結を設定するための過程を始める。 Further, as a response to the RRC connection request message, the RNC transmits an RRC connection setup message to the terminal. The terminal transmits an RRC connection setup complete message to the RNC. When the above process is completed successfully, the terminal and the RNC establish RRC connection. After the RRC connection is established, the terminal starts a process for setting up the signal connection by transmitting an IDT message.
図７は、本発明の一実施例による端末のハンドオーバー過程を示す図である。図７を参照すると、端末は、一定の基準を満足するかまたは特定イベントが発生すると、測定報告メッセージを中心基地局に伝送する（Ｓ７１０）。中心基地局は、端末との無線通信端子としての役割の他に、ＲＲＣ管理機能も果たすことができる。測定報告メッセージは、端末により測定された隣接セルからの信号強度と関連した情報を含むことができる。 FIG. 7 is a diagram illustrating a handover process of a terminal according to an embodiment of the present invention. Referring to FIG. 7, if the terminal satisfies a certain criterion or a specific event occurs, the terminal transmits a measurement report message to the central base station (S710). In addition to serving as a wireless communication terminal with the terminal, the central base station can also perform an RRC management function. The measurement report message may include information related to signal strength from neighboring cells measured by the terminal.
本発明の一実施例による上記端末のハンドオーバー過程における測定報告メッセージ伝送時に、非同期化状態にあるこの端末は、使用可能な無線資源の大きさによって、無線資源が許容する大きさ内でセルの測定結果を送信することができる。例えば、特定時点で、端末に中心基地局から割り当てられた無線資源が１００ビットで、測定報告メッセージに含まれる一つのセル情報のためには３０ビットが必要であるとしたら、端末は、３つのセルの測定結果のみを含めて送信するようになる。また、端末のハンドオーバー成功率を高める目的で、測定報告メッセージを送る時に、非同期化状態にある端末は、自身が測定したセルのうち、最も大きい信号を有するセルのみの測定結果を報告しても良い。 According to an embodiment of the present invention, when the measurement report message is transmitted in the handover process of the terminal, the terminal in the desynchronized state has a cell size within a size allowed by the radio resource according to the size of the available radio resource. Measurement results can be transmitted. For example, if the radio resource allocated to the terminal from the central base station is 100 bits at a specific time and 30 bits are required for one cell information included in the measurement report message, the terminal has three Only the measurement result of the cell is transmitted. In addition, when sending a measurement report message for the purpose of increasing the handover success rate of the terminal, the terminal in the desynchronized state reports only the measurement result of the cell having the largest signal among the cells measured by itself. Also good.
端末が中心基地局に測定報告メッセージを伝送するためには中心基地局と同期化状態におらなければならない。もし、非同期化状態にあると同期化過程を行なう。Ｅ−ＵＴＲＡＮシステムにおいて端末の同期化はＲＡＣＨ（Random Access Channel）を通じて行なわれる。ＲＡＣＨについて以下に説明する。 In order for the terminal to transmit the measurement report message to the central base station, the terminal must be synchronized with the central base station. If in an asynchronous state, the synchronization process is performed. In the E-UTRAN system, terminal synchronization is performed through RACH (Random Access Channel). The RACH will be described below.
ＲＡＣＨチャネルは、上りリンク（uplink）で短い長さのデータを伝送するために使われ、ＲＲＣ連結要請メッセージ（RRC Connection Request Message）とセル更新メッセージ（Cell Update Message）、ＵＲＡ更新メッセージ（URA Update Message）などの一部ＲＲＣメッセージもＲＡＣＨを通じて伝送されることができる。 The RACH channel is used to transmit short-length data in the uplink, and includes an RRC connection request message (RRC Connection Request Message), a cell update message (Cell Update Message), and a URA update message (URA Update Message). ) Etc. can also be transmitted over RACH.
また、論理チャネルの一つであるＣＣＣＨ（Common Control Channel）、ＤＣＣＨ（Dedicated Control Channel）またはＤＴＣＨ（Dedicated Traffic Channel）は、伝送チャネルの一つであるＲＡＣＨにマッピングされることができる、また、伝送チャネルの一つであるＲＡＣＨは再び物理チャネルの一つであるＰＲＡＣＨ（Physical Random Access Channel）にマッピングされる。上りリンク物理チャネルＰＲＡＣＨは、プリアンブル部分（Preamble Part）とメッセージ部分（message Part）とに分けられる。プリアンブル部分は、メッセージ伝送に使われる適切な伝送電力を調節する電力ランピング（Power Ramping）機能と、多数の端末間の衝突（Collision）を防止する機能を果たし、中心基地局が上りリンクメッセージ伝送のための資源を割り当てることができるように上りリンクメッセージ情報またはチャネル測定情報をプリアンブルに含むことができる。メッセージ部分は、ＭＡＣから物理チャネルに伝達したＭＡＣ ＰＤＵを伝送する役割を果たす。具体的なＲＡＣＨ過程は次の通りである。 Moreover, CCCH (Common Control Channel), DCCH (Dedicated Control Channel), or DTCH (Dedicated Traffic Channel), which is one of logical channels, can be mapped to RACH, which is one of the transmission channels. RACH, which is one of the channels, is mapped again to PRACH (Physical Random Access Channel), which is one of the physical channels. The uplink physical channel PRACH is divided into a preamble part (Preamble Part) and a message part (message Part). The preamble part performs a power ramping function that adjusts the appropriate transmission power used for message transmission and a function to prevent collision between multiple terminals, and the central base station performs uplink message transmission. Uplink message information or channel measurement information can be included in the preamble so that resources can be allocated. The message part plays a role of transmitting the MAC PDU transmitted from the MAC to the physical channel. A specific RACH process is as follows.
端末に含まれるＭＡＣ階層が端末の物理階層にＰＲＡＣＨ伝送を指示する。すると、端末の物理階層は、一つのアクセススロット（Access Slot）と一つのシグネチャー（Signature）を選択し、選択された結果によってＰＲＡＣＨプリアンブルを上りリンク（Uplink）で伝送する。 The MAC layer included in the terminal instructs PRACH transmission to the physical layer of the terminal. Then, the physical layer of the terminal selects one access slot (Access Slot) and one signature (Signature), and transmits the PRACH preamble on the uplink according to the selected result.
端末がプリアンブルを伝送すると、基地局は、下りリンク物理チャネルＡＩＣＨ（Acquisition Indicator Channel）を通じて応答信号を伝送する。プリアンブルに対する応答として伝送されるＡＩＣＨは、端末が伝送したシグネチャーとプリアンブル伝送に対する承諾または拒絶に対する情報、端末に割り当てる無線網臨時端末識別子（Temporary C-RNTI、Cell Radio Network Temporary Identifier）及びＲＲＣ連結要請メッセージの伝送と関連した制御情報を含む。ＲＲＣ連結要請メッセージ伝送と関連した制御情報は、無線資源割当情報、メッセージ大きさ、ＲＲＣ連結要請メッセージ伝送のための無線パラメータ（変調及びコーディング情報、Hybrid ARQ情報等）、タイミング情報を含む。 When the terminal transmits the preamble, the base station transmits a response signal through a downlink physical channel AICH (Acquisition Indicator Channel). The AICH transmitted as a response to the preamble includes a signature transmitted by the terminal, information on acceptance or rejection of the preamble transmission, a radio network temporary terminal identifier (Temporary C-RNTI, Cell Radio Network Temporary Identifier) assigned to the terminal, and an RRC connection request message. Control information related to the transmission of The control information related to the RRC connection request message transmission includes radio resource allocation information, message size, radio parameters for RRC connection request message transmission (modulation and coding information, Hybrid ARQ information, etc.), and timing information.
ランダムアクセス応答メッセージの受信のためのシグナリング情報は、Ｌ１／Ｌ２制御チャネルを通じて知らせる。このシグナリング情報は、ランダムアクセス応答メッセージの伝送を指示するＲＡ−ＲＮＴＩ（Random Access Radio Network Temporary Identifier）とランダムアクセス応答メッセージ伝送と関連した伝送パラメータとを含む。 Signaling information for receiving the random access response message is notified through the L1 / L2 control channel. This signaling information includes RA-RNTI (Random Access Radio Network Temporary Identifier) for instructing transmission of a random access response message and transmission parameters related to the random access response message transmission.
中心基地局は、端末からの測定報告メッセージを参照してハンドオーバーが必要な状況だと判断されるとハンドオーバー決定をおろす（Ｓ７１５）。システムによっては、端末が自らハンドオーバー決定をおろしそれを中心基地局に通報することも可能である。中心基地局がハンドオーバー決定をおろすと、対象基地局（target NB）にハンドオーバー準備メッセージを伝送する（Ｓ７２０）。ハンドオーバー準備メッセージは、端末文脈情報及び状態情報を含む。状態情報は、端末と中心基地局間の連結設定状態と関連した情報及びデータ送受信状態と関連した情報のうち少なくとも一つを含む。状態情報は、端末文脈情報に含まれる形態で構成されることができる。他の実施例として、状態情報は、ハンドオーバーメッセージに含まれずに、別のメッセージ形態として対象基地局に伝達されても良い。 If the central base station determines that the situation is that the handover is necessary with reference to the measurement report message from the terminal, the central base station determines the handover (S715). Depending on the system, the terminal can make a handover decision and report it to the central base station. When the central base station makes a handover decision, a handover preparation message is transmitted to the target base station (target NB) (S720). The handover preparation message includes terminal context information and status information. The state information includes at least one of information related to the connection setting state between the terminal and the central base station and information related to the data transmission / reception state. The state information can be configured in a form included in the terminal context information. As another example, the state information may be transmitted to the target base station as another message form without being included in the handover message.
連結設定状態と関連した情報は、例えば、端末が中心基地局と上りリンク同期化状態であるかまたは非同期化状態であるかを指示する情報を含む。上りリンク同期化状態について説明すると、下記の通りである。 The information related to the connection setting state includes, for example, information indicating whether the terminal is in an uplink synchronization state or an asynchronous state with the central base station. The uplink synchronization state will be described as follows.
前述したように、Ｅ−ＵＴＲＡＮシステムにおける物理チャネルにＯＦＤＭＡ方式を使用する。 As described above, the OFDMA scheme is used for the physical channel in the E-UTRAN system.
ＯＦＤＭＡ方式は、周波数帯域を一定の大きさの帯域に分け、それぞれの帯域を多数の端末に割り当てる方式のことをいう。この場合、各周波数帯域で伝送されるデータが他の帯域で伝送されるデータの干渉を受けることからデータ受信が正しく行なわれない場合を防ぐために、ＯＦＤＭでは各端末間の伝送時間の同期化が重要とされる。すなわち、ある特定時間区間に端末１と端末２が伝送するようにスケジューリングされた時、端末１の伝送が基地局に到着する時間と端末２の伝送が基地局に到着する時間は一致しなければならない。これら端末の伝送が到着する時間に小さいずれでもあれば、端末１と端末２のデータは基地局で正しく復旧されることができなくなる。
The OFDMA scheme is a scheme in which a frequency band is divided into bands of a certain size and each band is allocated to a large number of terminals. In this case, in order to prevent a case where data transmitted in each frequency band is interfered with data transmitted in other bands and data reception is not performed correctly, in OFDM, transmission time synchronization between terminals is synchronized. It is considered important. That is, when the
したがって、Ｅ−ＵＴＲＡＮシステムでは各端末の上りリンクチャネル伝送の同期化が必須である。そのために様々な方法が用いられている。その一つの方式はＲＡＣＨを使用することである。基地局と上りリンクチャネルの同期化を維持できない端末は、ＲＡＣＨにあらかじめ定められたビットストリーム、すなわち、シグネチャー（signature）を伝送し、基地局は、シグネチャーを検出し、検出した信号に基づいて端末の伝送が上りリンクチャネルで同期化するためにどれくらい遅らせねばならないかあるいは早めねばならないかを計算し、この結果を端末に知らせる。この値に基づいて端末は自身の伝送時間を調整した後、上りリンク同期化を行なう。 Therefore, in the E-UTRAN system, it is essential to synchronize the uplink channel transmission of each terminal. Various methods are used for this purpose. One way is to use RACH. The terminal that cannot maintain the uplink channel synchronization with the base station transmits a bit stream, i.e., signature, predetermined in the RACH, and the base station detects the signature, and the terminal based on the detected signal It calculates how much it must be delayed or advanced in order to synchronize on the uplink channel and informs the terminal of this result. Based on this value, the terminal adjusts its transmission time and then performs uplink synchronization.
端末のデータ送受信状態と関連した情報は、端末のデータ送信及び受信状態と関連した活性化状態または活性化レベル（activity level）情報を含む。例えば、端末のデータ送受信がどれだけの時間なかったか、あるいは端末のデータの送受信活動の程度を表示するレベル情報が含まれることができる。または、現在のＤＲＸレベルを含むことができる。または、伝送活性化レベル情報は、端末がどれくらい頻繁に伝送を行なうか、どれだけの時間データの送受信がなかったか、または、最後の送受信時間に関する情報を含むことができる。 The information related to the data transmission / reception state of the terminal includes an activation state or activity level information related to the data transmission / reception state of the terminal. For example, level information indicating how long the terminal has not transmitted / received data or the degree of data transmission / reception activity of the terminal may be included. Alternatively, the current DRX level can be included. Alternatively, the transmission activation level information may include information on how often the terminal performs transmission, how much time data has not been transmitted / received, or the last transmission / reception time.
データ送受信状態情報は、中心基地局と端末とのデータ伝送レートの最大値、最低値または平均値と、中心基地局と端末とのデータの伝送間隔の最大値、最小値または平均値などを含むことができる。また、データ送受信状態情報は、中心基地局と、端末とのデータの伝送の活動量（Duty Cycle or Duty factor）の最大値、最小値または平均値などを含むことができる。これらは一定の期間にどれくらい頻繁にデータの送受信が行なわれるかを知らせる値である。 The data transmission / reception status information includes the maximum value, minimum value or average value of the data transmission rate between the central base station and the terminal, and the maximum value, minimum value or average value of the data transmission interval between the central base station and the terminal. be able to. Further, the data transmission / reception state information may include a maximum value, a minimum value, an average value, or the like of an activity amount (Duty Cycle or Duty factor) of data transmission between the central base station and the terminal. These are values that inform how often data is transmitted and received during a certain period.
連結設定状態と関連した情報は、中心基地局と端末とのＲＲＣ連結状態または端末の上りリンク方向への同期化状態の管理に必要な情報を含む。すなわち、端末のＲＲＣ状態または同期化状態を調整するのに必要な情報である。また、連結設定状態と関連した情報は、対象基地局と端末とのＲＲＣ連結状態または端末の上りリンク方向への同期化状態の遷移がいつ起きなければならないかあるいは状況によっていつ起きれば良いかを知らせる情報を含むことができる。 The information related to the connection setting state includes information necessary for managing the RRC connection state between the central base station and the terminal or the synchronization state in the uplink direction of the terminal. That is, it is information necessary for adjusting the RRC state or synchronization state of the terminal. In addition, the information related to the connection setting state indicates when the RRC connection state between the target base station and the terminal or when the transition of the synchronization state in the uplink direction of the terminal should occur or depending on the situation. Information to inform can be included.
データ送受信状態情報は、中心基地局がどれだけの時間端末へデータを伝送しなかったか、または、端末からどれだけの時間データを受信しなかったかに関する情報を含む。または、データ送受信状態情報は、端末への最後のデータ伝送あるいは端末からの最後のデータ受信がいつであるかに関する情報を含むことができる。 The data transmission / reception status information includes information on how many times the central base station did not transmit data or how much time data was not received from the terminals. Alternatively, the data transmission / reception status information may include information regarding when the last data transmission to the terminal or the last data reception from the terminal is received.
データ送受信状態情報は、端末に設定された不連続受信状態設定値（DRX parameter: Discontinuous Reception Parameter）に関する情報、端末が最後に使用した不連続受信状態設定値、端末に設定された複数個の不連続受信状態設定値をさらに含むことができる。不連続受信状態設定値は、端末が周期的に下りリンクチャネルを受信する間隔（Period）、または、端末の不連続受信レベル（DRX level）あるいは不連続受信レベルで端末が留まった時間に関する情報などを含む。 The data transmission / reception status information includes information on the discontinuous reception parameter setting value (DRX parameter: Discontinuous Reception Parameter) set in the terminal, the discontinuous reception status setting value used last by the terminal, and a plurality of errors set in the terminal. A continuous reception state setting value may be further included. The discontinuous reception state setting value is the interval at which the terminal periodically receives the downlink channel (Period), or information on the time the terminal stayed at the discontinuous reception level (DRX level) or the discontinuous reception level of the terminal, etc. including.
再び図６を参照すると、中心基地局からハンドオーバー準備メッセージを受信した対象基地局は、自身の有無線資源を考慮してハンドオーバー要求に対する受容可否を決定し、受容可能な場合には端末との連結のための資源を確保する（Ｓ７２５）。中心基地局は、端末に対する新しい臨時端末識別子（Ｃ−ＲＮＴＩ）と一緒に端末に対する資源設定情報及び端末が対象基地局の新しいセルで使用すべき情報を含む端末文脈確認メッセージを、中心基地局に伝達する（Ｓ７３０）。 Referring to FIG. 6 again, the target base station that has received the handover preparation message from the central base station determines whether or not to accept the handover request in consideration of its own wired and wireless resources. Resources for concatenating are secured (S725). The central base station sends a terminal context confirmation message including resource setting information for the terminal together with a new temporary terminal identifier (C-RNTI) for the terminal and information that the terminal should use in the new cell of the target base station to the central base station. Transmit (S730).
端末文脈確認メッセージは、端末がハンドオーバー終了後に新しいセルで行なわねばならない動作（actions）に関連した動作情報を含むことができる。例えば、端末文脈確認メッセージは、端末がハンドオーバー終了後に新しいセルで上りリンク同期化過程を行なわねばならないかまたは行なわなくても良いかに関する情報を含むことができる。すなわち、端末がハンドオーバー前に中心基地局と上りリンク非同期状態にある場合は、ハンドオーバー終了後に対象基地局の新しいセルにおいても上りリンク同期化過程を行なう必要がない。したがって、対象基地局は中心基地局に端末がハンドオーバー完了後に上りリンク同期化過程を行なう必要がないということを知らせる。上りリンク同期化過程はＲＡＣＨを通じて行なわれるので、端末文脈確認メッセージは、端末がハンドオーバー完了後に新しいセルでＲＡＣＨ過程を行なわねばならないか、あるいは、行なわなくても良いかに関する情報を含むことができる。または、端末が中心基地局と同期化関連タイマー区間内にあって同期状態であるときに、端末が対象基地局に送信するデータがある場合は当該データをＲＡＣＨ過程を通じて送らなければならず、よって、端末文脈確認メッセージはそれに関する情報を表す情報として役割をする。 The terminal context confirmation message may include operation information related to actions that the terminal must perform in a new cell after the handover is completed. For example, the terminal context confirmation message may include information on whether the terminal should or may not perform an uplink synchronization process in a new cell after the handover is completed. That is, when the terminal is in an uplink asynchronous state with the central base station before the handover, it is not necessary to perform the uplink synchronization process even in the new cell of the target base station after the handover is completed. Accordingly, the target base station informs the central base station that the terminal does not need to perform an uplink synchronization process after the handover is completed. Since the uplink synchronization process is performed through the RACH, the UE context confirmation message may include information on whether the UE should perform the RACH process in a new cell after the handover is completed or not. . Or, when the terminal is in the synchronization-related timer section with the central base station and is in a synchronization state, if there is data to be transmitted by the terminal to the target base station, the data must be sent through the RACH process, The terminal context confirmation message serves as information representing information related thereto.
端末文脈確認メッセージは、端末がハンドオーバー完了後に対象基地局にハンドオーバー確認メッセージを伝送しなければならないか、または、伝送しなくても良いかに関する情報を含むことができる。端末はハンドオーバーを行なうと中心基地局や対象基地局にハンドオーバー確認メッセージを伝送しなければならないが、端末がハンドオーバー確認メッセージを伝送すべきか否かについての情報によってどちらの方に伝送するかを決定できる。端末文脈確認メッセージは、端末が新しいセルで適用しなければならない不連続受信状態設定値に関する情報をさらに含むことができる。また、端末文脈確認メッセージは、端末が新しいセルで行なわねばならない測定（measurement）関連パラメータをさらに含むことができる。すなわち、端末がハンドオーバー前に上りリンク非同期化状態であったことから対象基地局と同期化過程を行なわない場合には、既存の同期化過程を通じて受け取るべき測定関連パラメータを端末文脈確認情報を通じて受け取ることができる。 The terminal context confirmation message may include information regarding whether the terminal should or should not transmit the handover confirmation message to the target base station after the handover is completed. When a terminal performs a handover, it must transmit a handover confirmation message to the central base station and the target base station. Which terminal transmits the handover confirmation message depending on whether or not the handover confirmation message should be transmitted Can be determined. The terminal context confirmation message may further include information on the discontinuous reception state setting value that the terminal must apply in the new cell. The terminal context confirmation message may further include measurement related parameters that the terminal must perform in a new cell. That is, when the terminal is not synchronized with the target base station before the handover, the measurement related parameter to be received through the existing synchronization process is received through the terminal context confirmation information. be able to.
中心基地局は端末に端末文脈確認メッセージの少なくとも一部を含むハンドオーバー命令メッセージを伝送し（Ｓ７４０）、対象基地局に使用者データの伝送を始める。このハンドオーバー命令メッセージは、ハンドオーバー完了後に端末が新しいセルで行なわねばならない動作と関連した動作情報を含む。端末がハンドオーバー完了後に新しいセルで特定動作を行なわねばならないかまたは行なわなくて済むかは、中心基地局または対象基地局により決定されることができる。 The central base station transmits a handover command message including at least a part of the terminal context confirmation message to the terminal (S740), and starts transmitting user data to the target base station. This handover command message includes operation information related to the operation that the terminal must perform in the new cell after the handover is completed. It may be determined by the central base station or the target base station whether the terminal has to perform a specific operation in the new cell after the handover is completed.
端末は、ハンドオーバー完了後に新しいセルでハンドオーバー命令メッセージに含まれた動作情報に基づく動作を行なう。例えば、動作情報がハンドオーバー完了後に対象基地局でハンドオーバー確認メッセージを伝送することまたは伝送しないことを指示すると、端末はその指示にしたがって新しいセルに移動した後に対象基地局にハンドオーバー確認メッセージを伝送するか伝送しない。 The terminal performs an operation based on the operation information included in the handover command message in a new cell after the handover is completed. For example, if the operation information indicates that the target base station transmits or does not transmit the handover confirmation message after the handover is completed, the terminal sends a handover confirmation message to the target base station after moving to a new cell according to the instruction. Transmit or not transmit.
他の例として、動作情報が、ハンドオーバー完了後に端末が上りリンク同期化過程（またはＲＡＣＨ過程）を行なうことまたは行なわないことを指示する場合、端末はその指示にしたがって新しいセルに移動した後に上りリンク同期化過程（またはＲＡＣＨ過程）を行なうか行なわない。 As another example, when the operation information indicates that the terminal performs or does not perform an uplink synchronization process (or RACH process) after the handover is completed, the terminal moves to a new cell after moving to the new cell according to the instruction. The link synchronization process (or RACH process) is performed or not performed.
本発明の一実施例で提案する上記行なうべき過程には、ハンドオーバー命令が指示する場合、端末は新しいセルに移動する前に、現在使用中のセルに、ハンドオーバー確認メッセージを伝送することを含む。または、ハンドオーバー命令が指示する場合、端末は新しいセルに移動する前に、現在使用中のセルに、ハンドオーバー確認メッセージを伝送しないことを含む。 In the above-described process to be performed proposed in an embodiment of the present invention, when the handover command indicates, the UE transmits a handover confirmation message to the currently used cell before moving to the new cell. Including. Or, if the handover command indicates, the terminal does not transmit a handover confirmation message to the cell currently in use before moving to the new cell.
端末がハンドオーバー完了後に新しいセルで上りリンク同期化過程を行なう場合、端末は、対象基地局とのタイミング同期化を含む無線環境を再設定するために第１階層（Layer 1）及び第２階層（Layer 2）に関するシグナリングを行なう（Ｓ７５０）。動作情報が、新しいセルから対象基地局にハンドオーバー確認メッセージを伝送することを指示した場合、端末は、ハンドオーバー完了後に対象基地局にハンドオーバー確認メッセージを伝送する（Ｓ７６０）。対象基地局は、コアネットワーク（ＭＭＥ／ＵＰＥ）に端末の位置を更新するように要請する（Ｓ７８０）。 When the UE performs the uplink synchronization process in the new cell after the handover is completed, the UE performs the first layer (Layer 1) and the second layer in order to reset the radio environment including the timing synchronization with the target base station. Signaling for (Layer 2) is performed (S750). When the operation information indicates that the handover confirmation message is transmitted from the new cell to the target base station, the terminal transmits the handover confirmation message to the target base station after the handover is completed (S760). The target base station requests the core network (MME / UPE) to update the location of the terminal (S780).
コアネットワークは、以降に端末に対する経路設定を切り替え（switch）、既存に中心基地局に伝達していた使用者データを対象基地局に伝達する（Ｓ７９０）。 The core network subsequently switches (switches) the route setting for the terminal, and transmits the user data that has been transmitted to the central base station to the target base station (S790).
一方、動作情報が、端末がハンドオーバー完了後に新しいセルで上りリンク同期化過程を行なわないということを指示する場合には、新しいセルで上りリンク同期化過程を行なう必要がない（Ｓ７５０不移行）。また、動作情報が、端末がハンドオーバー完了後に対象基地局にハンドオーバー確認メッセージを伝送しないということを指示する場合、端末はハンドオーバー確認メッセージを対象基地局に送信する必要がない（Ｓ７６０不移行）。 On the other hand, when the operation information indicates that the terminal does not perform the uplink synchronization process in the new cell after the handover is completed, it is not necessary to perform the uplink synchronization process in the new cell (S750 non-transition). . Also, if the operation information indicates that the terminal does not transmit the handover confirmation message to the target base station after the handover is completed, the terminal does not need to transmit the handover confirmation message to the target base station (S760 non-transition). ).
対象基地局は、中心基地局にハンドオーバーの成功を知らせるハンドオーバー終了メッセージを伝送する（Ｓ７７０）。すると、中心基地局は、端末に対する資源を全て解除する。対象基地局は、コアネットワーク（ＭＭＥ／ＵＰＥ）に端末の位置を更新するように要請する（Ｓ７８０）。その後、コアネットワークは、端末に対する経路設定を切り替え、既存に中心基地局に送っていた使用者データを対象基地局に送る（Ｓ７９０）。 The target base station transmits a handover end message notifying the central base station of the successful handover (S770). Then, the central base station releases all resources for the terminal. The target base station requests the core network (MME / UPE) to update the location of the terminal (S780). Thereafter, the core network switches the route setting for the terminal, and sends the user data that has been sent to the central base station to the target base station (S790).
本発明の一実施例によるハンドオーバー過程では、端末が対象基地局の新しいセルに移動すると、この端末が中心基地局で使用していたパラメータを引き続き使用することができる。このようなパラメータには、不連続受信（ＤＲＸ）設定値、同期化関連タイマー、非同期化遷移タイマー、周期的なセルアップデート伝送プロシージャー用タイマー、周期的測定報告メッセージ伝送タイマーなどがある。 In the handover process according to an embodiment of the present invention, when the terminal moves to a new cell of the target base station, the parameters used by the terminal at the central base station can continue to be used. Such parameters include discontinuous reception (DRX) set values, synchronization related timers, desynchronization transition timers, periodic cell update transmission procedure timers, and periodic measurement report message transmission timers.
不連続受信設定値は、端末が不連続受信を行なうために使用する。同期化関連タイマー（Synchronization timer）設定値は、端末が周期的に同期化過程を行なうために必要なタイマー値などに関する情報である。非同期化遷移タイマー（Non-synchronized state transition timer）設定値は、端末が同期化過程を行なった後、どれくらいの時間後に非同期状態に遷移するかを設定するのに関連した値である。上記周期的なセルアップデート伝送プロシージャー用タイマー（Periodic Cell Update Timer）設定値は、端末がどれくらいの時間間隔でセルアップデートを行わねばならないかに関する設定値である。周期的測定報告メッセージ伝送タイマー（Periodic Measurement Report Timer）設定値は、端末がどれくらいの時間間隔で測定報告メッセージを伝送しなければならないかに関する設定値である。 The discontinuous reception setting value is used for the terminal to perform discontinuous reception. The synchronization-related timer (Synchronization timer) setting value is information related to a timer value necessary for the terminal to periodically perform the synchronization process. The set value of the non-synchronized state transition timer is a value related to setting how long the terminal transitions to the asynchronous state after performing the synchronization process. The periodic cell update transmission procedure timer (Periodic Cell Update Timer) setting value is a setting value relating to how many time intervals the terminal must perform cell update. The periodic measurement report message transmission timer (Periodic Measurement Report Timer) setting value is a setting value regarding how many time intervals the terminal must transmit the measurement report message.
すなわち、端末が既存のセルでＤＲＸ周期が１秒だったし、ハンドオーバー直前に端末がＤＲＸ周期の０．５秒を送ったとすれば、端末は、新しいセルで、ＤＲＸの残りの値、すなわち、残り０．５秒間ＤＲＸを行なう。 That is, if the terminal is an existing cell and the DRX cycle is 1 second, and the terminal sends 0.5 seconds of the DRX cycle immediately before handover, the terminal is the new cell and the remaining DRX value, that is, DRX is performed for the remaining 0.5 seconds.
本発明の一実施例において、中心基地局が対象基地局に端末に対する状態情報を伝送し、対象基地局はこれを用いて端末がハンドオーバー完了後に新しいセルで行なう動作を決定し、中心基地局を介して端末に伝達する。すなわち、新しいセルで同期化過程などを行うか否かを対象基地局が判定し、中心基地局は、単純にこれに関連した情報を単に端末と対象基地局との間に中継する役割を果たす。 In one embodiment of the present invention, the central base station transmits state information for the terminal to the target base station, and the target base station uses this to determine an operation to be performed by the terminal in a new cell after the handover is completed, To the terminal via. That is, the target base station determines whether or not to perform a synchronization process in a new cell, and the central base station simply relays information related to this between the terminal and the target base station. .
他の実施例として、中心基地局が、ハンドオーバー後に新しいセルで端末が行なわねばならない動作を決定し、これを端末に伝達できる。例えば、端末の上りリンク同期化過程（ＲＡＣＨ過程）、ハンドオーバー確認メッセージ送信などに関する決定を中心基地局で行い、端末にハンドオーバー命令を通じて伝送することができる。 As another example, the central base station can determine the operation that the terminal has to perform in the new cell after the handover and communicate this to the terminal. For example, a decision regarding the uplink synchronization process (RACH process) of the terminal, transmission of a handover confirmation message, etc. can be made at the central base station and transmitted to the terminal through a handover command.
以上では本発明について具体的な実施例に挙げて説明してきたが、当該技術分野における通常の知識を持つ者は、本発明の技術的思想及び領域を逸脱しない範囲内で本発明を様々に修正及び変形して実施できるということを理解する。したがって、本発明は、本発明の精神及び必須特徴を逸脱しない範囲で他の特定の形態に具体化できることは当業者にとっては自明である。したがって、上記の詳細な説明は、あらゆる面において制約的に解釈されてはいけなく、例示的なものとして考慮されなければならない。本発明の範囲は、添付した特許請求の範囲の合理的解釈により決定すべきであり、本発明の等価的範囲内における変更はいずれも本発明の範囲に含まれる。 Although the present invention has been described above with reference to specific embodiments, those skilled in the art can modify the present invention in various ways without departing from the technical idea and scope of the present invention. And understand that it can be implemented with variations. Therefore, it will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the invention. Therefore, the above detailed description should not be construed as restrictive in any respect, but should be considered as exemplary. The scope of the invention should be determined by reasonable interpretation of the appended claims and any changes that come within the equivalent scope of the invention are included in the scope of the invention.
本発明は、移動通信システムまたは無線インターネットシステムのような無線通信システムに適用されることができる。 The present invention can be applied to a wireless communication system such as a mobile communication system or a wireless Internet system.
Claims (10)
第２基地局へのハンドオーバー決定後に、前記端末と前記第１基地局間の連結設定状態に関連した情報及びデータ送受信状態に関連した情報のうち少なくとも一つを含む状態情報を、前記第２基地局に伝送する段階と、
ハンドオーバー終了後に前記端末が行なわねばならない動作に関連した動作情報を前記端末に伝送する段階と、
を含む、ハンドオーバー制御方法。 A first base station connected to a terminal in a wireless communication system controls handover of the terminal,
After determining the handover to the second base station, state information including at least one of information related to a connection setting state between the terminal and the first base station and information related to a data transmission / reception state, Transmitting to the base station;
Transmitting operation information related to operations that the terminal must perform after the handover is completed to the terminal;
Including a handover control method.
前記端末がハンドオーバー完了後に前記第２セルで行なわねばならない動作に関連した情報を含む動作情報を、前記第１セルを管理する基地局または前記第２セルを管理する基地局から受信する段階と、
ハンドオーバー完了後に前記第２セルで前記動作情報による動作を行なう段階と、
を含む、ハンドオーバー方法。 A method in which a terminal performs a handover from a first cell to a second cell in a wireless communication system, comprising:
Receiving, from the base station managing the first cell or the base station managing the second cell, operation information including information related to an operation that the terminal must perform in the second cell after handover is completed; ,
Performing the operation according to the operation information in the second cell after handover is completed;
Including a handover method.
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| JP4903265B2 (en) | 2012-03-28 |
| ZA200901373B (en) | 2010-02-24 |
| EP2060138A2 (en) | 2009-05-20 |
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| AU2007288600A1 (en) | 2008-02-28 |
| KR20080018104A (en) | 2008-02-27 |
| WO2008023927A3 (en) | 2009-06-04 |
| US20100278143A1 (en) | 2010-11-04 |
| WO2008023927A2 (en) | 2008-02-28 |
| US8811336B2 (en) | 2014-08-19 |
| BRPI0716434A2 (en) | 2014-03-04 |
| TWI452866B (en) | 2014-09-11 |
| KR101265643B1 (en) | 2013-05-22 |
| MX2009001895A (en) | 2009-03-25 |
| EP2060138B1 (en) | 2016-09-28 |
| AU2007288600B2 (en) | 2010-09-16 |
| EP2060138A4 (en) | 2013-03-20 |
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